Extreme Power Analyzer - All-In-One Watt-Meter, Voltage Checker, and Cell Balancer An essential tool for any RC guy! Watt Meter: Measures current (Amps), voltage (Volts), power (Watts) and charge (Amp-hours) Voltage Checker: Check the individual cell voltages of 1 to 6 cell lithium battery packs. Cell Balancer: Integrated balance circuit will balance your pack without connection to a charger. Can handle up to 6S lithium batteries